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- W3092060939 abstract "<p>Rising atmospheric CO<sub>2</sub> concentrations are expected to stimulate plant carbon uptake (A) while also reducing transpiration via a decrease in stomatal conductance (g<sub>s</sub>), resulting in an increase in the intrinsic water use efficiency (iWUE, i.e. the ratio of A to g<sub>s</sub>). While there is overwhelming evidence of a secular iWUE increase in response to rising CO<sub>2</sub> over the 20th-21st century, the magnitude of changes in iWUE reported so far in the literature strongly varies across climatic regions and biomes. Moreover, increasing iWUE has not systematically been translated into tree growth increment at many forested ecosystems, challenging the CO<sub>2</sub> fertilization theory. There is thus a need to track down the key physiological and environmental mechanisms driving changes in iWUE.</p><p>Here we estimate the carbon isotopic discrimination (&#916;<sup>13</sup>C) - defined as the difference between the stable carbon isotopic compositions (&#948;<sup>13</sup>C) measured in atmospheric CO<sub>2</sub> and in tree rings &#8211; from 147 tree-ring &#948;<sup>13</sup>C chronologies to: 1) investigate the physiological responses of woody C3 plants to increasing atmospheric CO<sub>2 </sub>and, 2) disentangle climate vs CO<sub>2</sub> effects on A and g<sub>s</sub>. We specifically study deviations of tree-ring &#916;<sup>13</sup>C from the predicted &#916;<sup>13</sup>C response to CO<sub>2 </sub>as reconstructed from a recent meta-analysis of paleo and elevated CO<sub>2</sub> data. We identify the following: 1) negative deviations from the expected &#916;<sup>13</sup>C for most records; 2) no apparent deviation from expected &#916;<sup>13</sup>C or; 3) positive deviations, both in a small minority of records ; and 4) an apparent non-linear response with a switch from a more negative &#916;<sup>13</sup>C deviations to a &#916;<sup>13</sup>C-response consistent with predicted CO<sub>2</sub>-effects. The widespread negative &#916;<sup>13</sup>C &#160;deviations are consistent with g<sub>s</sub> having been reduced or A having not increased as much as expected for a given CO<sub>2</sub>-driven stimulation of A. The presented global tree-ring data analyses suggest that a warmer and often drier climate have had a stronger effect on &#916;<sup>13</sup>C compared to that of rising CO<sub>2</sub>, and a substantial modulation of recent rises in iWUE by climate effects across the globe.</p>" @default.
- W3092060939 created "2020-10-15" @default.
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- W3092060939 date "2020-03-23" @default.
- W3092060939 modified "2023-09-28" @default.
- W3092060939 title "Global trends of tree-ring carbon isotope discrimination under rising atmospheric CO2 and changing climate" @default.
- W3092060939 doi "https://doi.org/10.5194/egusphere-egu2020-12240" @default.
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